Valmiki Ramayana 7.51.24
समृद्धैश्चाश्वमेधैश्च इष्ट्वा परमदुर्जयः ।राजवंशांश्च बहुशो बहून्संस्थापयिष्यति॥
samṛddhaiścāśvamedhaiśca iṣṭvā paramadurjayaḥ |rājavaṃśāṃśca bahuśo bahūnsaṃsthāpayiṣyati ||
Our plain-language meaning of this verse is waiting for scholar review.
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